Radio communication system, radio terminal, radio station, and cell selection method
a radio communication system and radio terminal technology, applied in the field of radio communication systems, can solve the problems of large overhead of the above-described signals or information other than downlink user data, and the inability to optimize the use of downlink radio resources
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first embodiment
[0045]In an embodiment of the present invention, a first radio communication system including a radio station (for example, a radio base station, a base station control station, and other network entity) and a radio terminal as components is used as an example, and descriptions will be made.
[0046]In a first embodiment, in a radio system in which different types of cells are mixed, a radio terminal selects a cell (or another predetermined camping area) in consideration of a type of the cell, and thereby the cells of the radio terminal are appropriately distributed.
[0047]FIG. 1 is a block diagram illustrating the first embodiment of the present invention.
[0048]In the first embodiment of the present invention, in the first radio communication system, at least a part of radio station 1 has a control means to control a plurality of types of cells by using one radio access technology (Radio Access Technology: RAT), at least a part of radio terminal (UE) 2 has a recognition means to recogn...
first example
[0076]FIG. 2 is a block diagram illustrating the radio station 1 and the radio terminal (UE) 2 of the present invention.
[0077]In FIG. 2, the radio station 1 is configured by a radio signal receiver (Radio Signal Receiver) 10 that receives radio signals from the radio terminal (UE) 2, a demodulation unit (Demodulator) 11 that demodulates signals received from the radio terminal (UE) 2, a transmission unit (Transmitter) 12 that transmits signals to other network nodes (Other Network Node), a reception unit (Receiver) 13 that receives signals from other network nodes (Other Network Node), a control unit (Controller) 14 that has a function to control a plurality of types of cells by using one radio access technology (Radio Access Technology: RAT) and controls operations of the radio station such as transmission and reception of signals, a signal generation unit (Tx signal generator) 15 that generates signals to the radio terminal (UE), and a radio signal transmitter (Radio Signal Transm...
second example
[0084]FIG. 4 is a flowchart illustrating a procedure of the cell reselection according to the recognition unit 22 and the cell selection unit 24 of the radio terminal (UE) 2 of the present invention. Further, when the cell selection criteria are equal to criteria used in the cell reselection like the present example, the cell selection criteria can be also called the cell reselection criteria.
[0085]For example, when the cell reselection is triggered such as received quality of the serving cell is degraded by a predetermined value or more, the radio terminal (UE) 2 performs the cell search operation as n=0 and i=1 by using a predetermined method (Step 11). At this time, the radio terminal (UE) 2 may search the cell from the strongest cell (also called the best cell) of the same frequency band as that of the serving cell, search the cell from the strongest cell of a frequency band of high priority, or search the cell by using any method other than the above methods.
[0086]The radio ter...
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